Question

可能重复：
  How do I deep copy a DateTime object?
  Error in adding to 2d array or looping through 2d array

所以我的代码是：

    while ($end <= $to){
        $currentDates = array("from" => $start, "to"=>$end);
        $allDates[] = $currentDates;
        echo '<br>', var_dump($allDates);
        unset($currentDates);
        $start->add($intervalObj);
        $end->add($intervalObj);
    }

但每次将$ currentDates添加到$ allDates时，它会像我期望的那样为$ allDates添加一个位置，但它也会用$ currentDates的当前值覆盖所有先前的数组位置。

这是循环中var_dump的结果

array(1) { [0]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-10 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-11 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } } 

array(2) { [0]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-11 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-12 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } [1]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-11 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-12 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } } 

array(3) { [0]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-12 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-13 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } [1]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-12 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-13 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } [2]=> array(2) { ["from"]=> object(DateTime)#6 (3) { ["date"]=> string(19) "2012-10-12 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } ["to"]=> object(DateTime)#7 (3) { ["date"]=> string(19) "2012-10-13 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } } }

Answer 1

$start和$end是对象，始终通过引用分配。您需要创建新的，不同的对象。有关如何执行此操作，请参阅How do I deep copy a DateTime object?。

添加到二维数组时，所有值都被覆盖

1 个答案: